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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge. A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI3, is composed of iron ions, Fe3+ (elemental iron is a metal), and iodide ions, I- (elemental iodine is a nonmetal). Rule 1.
The shorthand symbol for a compound is its formula. Formula gives types atoms and numbers each atom in the Chemical compound. A binary ionic compound (a salt) is consisting of only monatomic ions of two elements in which one of is a cation formed by a metal and other an anion formed by a non-metal.